Ultrasound diagnostic apparatus, control method of ultrasound diagnostic apparatus, and processor for ultrasound diagnostic apparatus

A control method of an ultrasound diagnostic apparatus, the control method comprising:

• obtaining a reception signal from a transducer configured to transmit and receive ultrasonic waves to and from a subject and convert the received ultrasonic waves to the reception signal;
• sequentially generating a plurality of B-mode images in which at least a blood vessel is imaged based on the reception signal obtained by the transducer, where the plurality of B-mode images represent a longitudinal cross section along a traveling direction of the blood vessel;
• sequentially displaying each of the plurality of B-mode images;
• calculating a change amount of a position of the blood vessel within a predetermined time on the plurality of B-mode images;
• and
• upon determining that the position of the blood vessel is stable due to the change amount being equal to or less than a fixed value, automatically perform a process including:
• detecting a vascular wall by analyzing at least one of the plurality of B-mode images;
• setting a Doppler gate in the blood vessel on the plurality of B-mode images;
• acquiring Doppler data in the Doppler gate;
• calculating a blood flow velocity based on the Doppler data;
• and
• measuring a blood flow rate based on the detected vascular wall and the calculated blood flow velocity,
• wherein the control method further comprises
• searching for an anterior vascular wall in a shallow direction and searching for a posterior vascular wall in a deep direction, at a plurality of positions separated in an orientation direction from a center position decided based on coordinates of the anterior vascular wall and the posterior vascular wall,
• estimating a blood vessel traveling angle, and
• setting a Doppler steer angle such that an angle correction value for the blood vessel traveling angle is within 60 degrees.